A Three-Phase Power Flow Approach for Integrated 3-Wire MV and 4-Wire Multigrounded LV Networks With Rooftop Solar PV

被引:83
作者
Alam, M. J. E. [1 ]
Muttaqi, K. M. [1 ]
Sutanto, D. [1 ]
机构
[1] Univ Wollongong, Sch Elect Comp & Telecommun Engn, Endeavour Energy Power Qual & Reliabil Res Ctr, Wollongong, NSW 2522, Australia
基金
澳大利亚研究理事会;
关键词
Rooftop solar PV impacts; three-phase distribution networks; three-phase power flow; 3-wire and 4-wire multigrounded systems; NEUTRAL CURRENTS; IMPACT;
D O I
10.1109/TPWRS.2012.2222940
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
With increasing level of rooftop solar photovoltaic (PV) penetration into low voltage (LV) distribution networks, analysis with realistic network models is necessary for adequate capturing of network behavior. Traditional three-phase 3-wire power flow approach lacks the capability of exact analysis of 4-wire multigrounded LV networks due to the approximation of merging the neutral wire admittance into the phase wire admittances. Such an approximation may not be desirable when neutral wire and grounding effects need to be assessed, especially in the presence of single-phase solar power injection that may cause a significant level of network unbalance. This paper proposes a three-phase power flow approach for distribution networks while preserving the original 3-wire and 4-wire configurations for more accurate estimation of rooftop PV impacts on different phases and neutrals. A three-phase transformer model is developed to interface between the 3-wire medium voltage (MV) and the 4-wire LV networks. Also an integrated network model is developed for an explicit representation of different phases, neutral wires and groundings of a distribution system. A series of power flow calculations have been performed using the proposed approach to investigate the impacts of single-phase variable PV generation on an Australian distribution system and results are presented.
引用
收藏
页码:1728 / 1737
页数:10
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